Dorman M390026 Brake Master Cylinder

Brake Master Cylinder for Select Mitsubishi, Dodge, and Plymouth Models

Dorman M390026 is a brake master cylinder built to match the original design, function, and performance on select vehicles. It uses new, high-quality materials and an aluminum body for a durable replacement in brake hydraulic service.

• Brake master cylinder for select 1990-1994 vehicles
• Aluminum master cylinder construction
• 0.938 in. bore diameter
• Two outlet design
• Rearward outlet size: M10 x 1.0
• Secondary outlet thread diameter: 10 mm with 1.0 thread pitch
• Package contents: master cylinder only
• Reservoir not included
• Sensor not included

Fitment and Cross-Reference

Compatible with 1994 Dodge Colt, 1991-1994 Plymouth Laser, 1993 Mitsubishi Mirage, 1991-1992 Mitsubishi Eclipse, and 1990 Mitsubishi Galant. This part cross-references Raybestos Brakes MC390026 and Centric Parts 130.46515 for the same application. Dorman M390026 is also listed among interchange numbers including M900770 and MC502470.

Detailed Product Description

This brake master cylinder is engineered for vehicles that use a 15/16 in. bore size drum brake setup on multiple models. The aluminum housing helps provide a stable, corrosion-resistant foundation for brake hydraulic operation, while the two-outlet layout supports the original system routing. Dorman M390026 is a direct replacement-style component for Mitsubishi Eclipse, Mitsubishi Galant, Mitsubishi Mirage, Dodge Colt, and Plymouth Laser applications where the OE master cylinder has worn, leaked, or lost hydraulic performance.

What It Helps Address

• Brake pedal that sinks or feels inconsistent
• External or internal master cylinder fluid leakage
• Loss of hydraulic pressure in the brake system
• Uneven braking response from a worn master cylinder
• Restoration of proper brake fluid flow to the system

Installation Notes and Tips

Verify bore diameter, outlet thread size, and reservoir configuration before installation. This unit does not include mounting hardware, a reservoir, or a sensor, so reuse or source the required related components as needed. After installation, bleed the brake system thoroughly and confirm there are no leaks at either outlet connection.

Quality Assurance

Dorman designs this master cylinder to match the original part’s fit, function, and performance on the listed vehicles. The use of new materials and an aluminum body supports dependable brake hydraulic service in routine replacement work.